Calling dial



Patented July 20, 1926.

UNITED STATES PATENT OFFCE.

NOEL H. LYSONS, OF MONTREAL, QUEBEC, CANADA, ASSIGNOR TO VESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORORATION OF NEVI YORK.

CALLING DIAL.

Application filed August 29, 1924. Serial No. 734,865.

This invention relates to calling dials in general and more specifically to improve* ments in a calling dial of the type disclosed in Patent No. 1,279,352 issued to A. E. Keith, wherein the springs are mounted in a pile-up on the mounting plate and secured by screws which when unfastened cause the springs to separate froineach other and wherein the speed governor is mounted in separately detached parts on the dial mounting plate.

Such construction, holds the repairs and maintenance cost of such a dial very high since the dial must be taken apart for the replacement or repair of a. minor part.

The object of this invention is to provide a dial which will be simple, efficient, cheap to manufacture and in which parts which in service become inoperative are readily replaceable or renewable, thereby reducing the cost of maintenance to a minimum.

A feat-ure of the invention resides in the provision of a bracket for supporting the impulse cam and governor mechanism in a manner to form a unit which may be readily applied to or removed from the mounting plate.

Another feature is the provision of` a bracket for supporting the impulse and shunt springs of the dial together with the provision of means in the bracket whereby the springs may be readily disposed in adjustment with their associated shunt and impulse operating mechanism.

Another feature is the provision of an auxiliary stop whereby the motor spring is held in adjustment when the governor unit is removed.

Other features of the invention andk ad vantages will appear from the following description and by the claims appended thereto, reference being had to the accompanying drawings in which Fig. 1 is a plan view of the dial with portion of the linger wheel cut away to show the auxiliary stop more clearly. Fig. 2 is a back view thereof. Fig. 3 is a plan assembly view of the governor unit. Fig. 4 is a side view thereof. Fig. 5 is a plan assembly view of the spring unit and Fig. 6 is a side view thereof showing the bracket in adjusted position on the mounting late.A

The 'cal ing dialin which this invention nrtiularly well adapted for, "ein y centriste; of a supporting plate 1c the `central portion of which is rotatably mounted the shaft 13 of a linger wheel 11. A motor spring 12 having one end portion hooked on the plate 10 and the other end mounted in the slotted end portion of shaft 13 is provided for returning the finger wheel 11 to normal position against the resistance of a speed gbvernor mechanism shown in Figs. 2, 3 and 4.

The finger wheel 11 carries a clutch mechanism not shown) which permits the movement of the finger wheel in a clock-wise direction, ineffectively with respect to the impulse cam 15, in a manner described in the patent above referred to. The impulse wheel 15 is mounted on one end of shaft 16 and is held securely thereon by means of nuts 17 and 18. Apinion 19 secured on the shaft 16 is disposed in operable relation to a gear carried by the driven yportion of the clutch mechanism above referred to and is adapted to operate the impulse wheel 15 upon each return movement of finger wheel 11. The shaft 16 carries a worm gear 2O which is disposed in operable relation with the screw 21 integrally formed on the governor shaft 22. This shaft carries two centrifugally operated weights 23 and 24:

which cooperate with the stationary drum 33 for controlling the speed of the impulse cam 15 during the return movement of finger wheel 11. This shaft 22 is journaled on adjustable bearings 25 and 26 each of which is screwed on the bracket 27. Tntegrally formed with bracket 27 and yextending perpendicularly therefrom, there is provided an arm 28 on which one end of the shaft 16 is journaled. The arm 29 is held securely on the bracket 27 by means of screw 30 and locating pins 31 and 32 and is adapted forL supporting the upwardly extending end of shaft 16. By removing the y screw the arm 29 may be removed to permit the removal of the shaft 16 carrying the cam 15, wheel 20 and pinion 19, for purposes of replacement of any of these parts orrepair.

Bracket 27 is held securely on the supporting plate 10 by means of screws 3i and and locating pins 36 and 37 respectively. Bv means of this arrangement, the bracket 27 and the governor mechanism carried 'thereby may be conveniently mountedi or removed as a unit from `the supporting plate 16 for repas tof parte'. The te' t U-sha-ped bracket 45 on which the impulse springs 46 and 47 are mounted and insulated Yfrom the shunt spring 8, 49 and 50 by means of insulating strips 51. The bracket 45 is he'ld securely on the supporting plate 10 by means of screws 38 and 39 and locating pins 40 and Zll, one of them being shoivn in Fig. 6.

A linger stop 42, securely attached on' the plate l0 is provided with an inwardly extendi '1j ari'n i8 which cooperates with the pin le carried the linger rvheel ll to forman auxiliary stop to prevent the univinding oi' the motor spring Mas would otherwise occur when the pinion i9 is removed from the usual stop lug as the governor unit is removed from the supporting plate.

VVhatfis claimed is: Y l Y In a calling dial, mounting plate, im-

Ypulse springs vcarried` by said mounting plate, a iinger Wheel associated with said mounting plate, driving gear mechanism carried by said mounting plate and actuated kby said finger Wheel for operating said springs, a bracket a governor ior controlling the speed of said spring actuating mechanism` mounted on said bracket, a 'pinion thereon meshing with said gear mechanism, a spring actuatingpelement on said bracket, a. Worm gear on. said bracket, a Worin screw on Vsaid bracket 'with which saidnivorm gear meshes. and means for attaching said bracket and all of lthe elements carried thereby to the supporting plate as a unit. Y

2. In a'calling dial, a mounting plate,im pulse springs carried bysaid mounting plate, a linger Wheel associated with said mounting plate, driving gear mechanism carried by said mounting plate and actuated by said finger Wheel for operating said springs, a governor for controlling the speed of said gear mechanism,` a bracket carrying said Vtrol of said mechanism, impulse springs associated with said cam, a bracket 'for said governor mechanism and said cam, a sup; porting plate, registering means carried by said plate and said bracket for locating said impulse cani in adjustment relative to said springs, and means for securing Said bracket on said plate. v

Ll. In a calling dial, the combination with linger Wheel, a motor spring tensioned through the movement of said ringer Wheel, a plate, a. finger stop mounted on said plate, and cooperating means carried by said finger ndi-eel and said finger stop for holding said motor spring in adjustment. f

In calling dial, the combinatio'ii with i. moi'nitingplate, ank arcnated bracket havperpei'idicularly extending lugs on tvvo end portions, governor device journaled onsaid lugs, anrarm extending in opposite directionto said lugs, a shaft having one end portion pivotally arranged in said arm, a pinion and a v vorm gear' on said shaft ensaid device, an impulse cani carried by said shaft, and a support carried by said bracket for holding the opposite end portion of said pinion, the vvhole being readily atL tached to or removed from said plate as a Unit In witness whereof, I hereunto subscribe mv naine this 25th day of August A. D.,

NoniJ H. L'Ysons. 

